Bradford, Barbara
Intonation in context : intonation practice for upper-intermediate and advanced learners of English
Cambridge University Press, 1988
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Simpson, David
The politics of American English, 1776-1850i
Oxford University Press , 1986
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Wolfram, Walt, 1941-
American English: dialects and variation
Wiley Balckwell, 2016
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Walters, Morgan L
Basic dictionary of American English
N.Y.Holt Rinehart and Winston,inc, 1966
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Walters, Margan L
Intermediate dictionary of American english
N.Y.Holt,Rinehart and winston,ic, 1966
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